package com.wjf.birdfish.util;

import java.util.Calendar;    
import java.util.Date;    
import java.util.HashMap;    
import java.util.Iterator;    
import java.util.Map.Entry;    

public class HashMapTest        
{    
    public static void main(String[] args)    
     {    
         HashMap<String,String> kmap = new HashMap<String,String>();    
         HashMap<String, String> emap = new HashMap<String, String>();    
            
        //装数据    
        for (int i = 0; i < 1000; i++)    
         {    
             kmap.put(""+i, "YL");    
         }    
        for (int i = 0; i < 1000; i++)    
         {    
             emap.put(""+i, "ZT");    
         }    
            
        long stimes = System.currentTimeMillis();    
        long ctimes = Calendar.getInstance().getTimeInMillis();    
        long dtimes = new Date().getTime();    
            
        //初始时间 这里我用了三种取值方式 最后发现System.currentTimeMillis();是最直接的取值方法    
         System.out.println(stimes+" "+ctimes+"   "+dtimes);    
            
         Iterator<String> ktor = kmap.keySet().iterator();    
        while(ktor.hasNext())    
         {    
             System.out.println(ktor.next());    
         }    
            
        long stimes1 = System.currentTimeMillis();    
        long ctimes1 = Calendar.getInstance().getTimeInMillis();    
        long dtimes1 = new Date().getTime();    
            
        //结束世界并且也是entrySet的开始时间    
         System.out.println((stimes1-stimes)+"  *  "+(ctimes1-ctimes)+"  *   "+(dtimes1-dtimes));    
         System.out.println(stimes1+"     "+ctimes1+" "+dtimes1);    
            
         Iterator<Entry<String, String>> itor = emap.entrySet().iterator();    
        while(itor.hasNext())    
         {    
             Entry<String, String> e = itor.next();    
             System.out.println(e.getKey());    
             //System.out.println(e.getValue());    
         }    
            
        long stimes2 = System.currentTimeMillis();    
        long ctimes2 = Calendar.getInstance().getTimeInMillis();    
        long dtimes2 = new Date().getTime();    
         System.out.println(stimes2+"     "+ctimes2+" "+dtimes2);    
         System.out.println((stimes2-stimes1)+"  * "+(ctimes2-ctimes1)+"  *  "+(dtimes2-dtimes1));    
     }    
}   
